JP6247232B2 - 電極組立体の製造方法及びこれにより製造される電極組立体を含む電気化学素子 - Google Patents
電極組立体の製造方法及びこれにより製造される電極組立体を含む電気化学素子 Download PDFInfo
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- JP6247232B2 JP6247232B2 JP2014560872A JP2014560872A JP6247232B2 JP 6247232 B2 JP6247232 B2 JP 6247232B2 JP 2014560872 A JP2014560872 A JP 2014560872A JP 2014560872 A JP2014560872 A JP 2014560872A JP 6247232 B2 JP6247232 B2 JP 6247232B2
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Description
本発明で基本単位体に形成される電極は、正極又は負極に区別され、正極及び負極をその間に分離膜を介在させた状態で相互結合させて製造される。正極は、例えば、正極集電体上に正極活物質、導電材及びバインダの混合物を塗布した後、乾燥及びプレッシングして製造され得、必要に応じては混合物に充填剤をさらに添加したりする。このような構造はシート状に具現され、ローディングロールに装着される形態で工程に適用され得るようになる。
[正極集電体]
正極活物質はリチウム二次電池の場合、例えば、リチウムコバルト酸化物(LiCoO2)、リチウムニッケル酸化物(LiNiO2)などの層状化合物や、1又はそれ以上の遷移金属に置換された化合物;化学式Li1+xMn2-xO4(ここで、xは0〜0.33である)、LiMnO3、LiMn2O3、LiMnO2などのリチウムマンガン酸化物;リチウム銅酸化物(Li2CuO2);LiV3O8、LiFe3O4、V2O5、Cu2V2O7などのバナジウム酸化物;化学式LiNi1-xMxO2(ここで、M=Co、Mn、Al、Cu、Fe、Mg、B又はGaであり、x=0.01〜0.3である)で表されるNiサイト型リチウムニッケル酸化物;化学式LiMn2-xMxO2(ここで、M=Co、Ni、Fe、Cr、Zn又はTaで、x=0.01〜0.1である)又はLi2Mn3MO8(ここで、M=Fe、Co、Ni、Cu又はZnである)で表されるリチウムマンガン複合酸化物;化学式のLiの一部がアルカリ土金属イオンに置換されたLiMn2O4;ジスルフィド化合物;Fe2(MoO4)3などを挙げることができるが、これらだけで限定されるものではない。
負極は、負極集電体上に負極活物質を塗布・乾燥及びプレッシングして製造され得、必要に応じて前記のような導電材、バインダ、充填剤などが選択的にさらに含まれ得る。このような構造はシート状に具現され、ローディングロールに装着される形態で工程に適用され得る。
負極集電体は、一般的に3〜500μmの厚さに作製される。このような負極集電体は、当該電池に化学的変化を誘発すること無く導電性を有するものであれば特に制限されるものではなく、例えば、銅、ステンレススチール、アルミニウム、ニッケル、チタン、焼成炭素、銅やステンレススチールの表面にカーボン、ニッケル、チタン、銀などで表面処理したもの、アルミニウム−カドミウム合金などが用いられ得る。また、正極集電体と同様に、表面に微細な凹凸を形成して負極活物質の結合力を強化させることもでき、フィルム、シート、ホイル、ネット、多孔質体、発泡体、不織布体などの多様な形態で用いられ得る。
負極活物質は、例えば、難黒煙化炭素、黒煙系炭素などの炭素;LixFe2O3(0≦x≦1), LixWO2(0≦x≦1), SnxMe1-xMe’yOz (Me:Mn, Fe, Pb, Ge; Me’:Al、B、P、Si、周期律表の1族、2族、3族元素、ハロゲン;0<x≦1;1≦y≦3;1≦z≦8)などの金属複合酸化物;リチウム金属;リチウム合金;ケイ素系合金;錫系合金;SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, and Bi2O5などの金属酸化物;ポリアセチレンなどの導電性高分子;Li-Co-Ni系材料などを用いることができる。
本発明に係る分離膜は、フォールディング工程やロール(roll)工程とは係りなく、単純積層工程により基本単位体を形成して単純積層を具現することになる。特に、ラミネータでの分離膜と正極、負極の接着は、ラミネータの内部で分離膜シート自体が熱によって溶融され接着固定されるようにするものである。これによって、圧力が続いて維持されるようにするところ、電極と分離膜シートとの間の安定的な界面接触を可能にする。
Claims (8)
- 第1電極、第1分離膜、第2電極及び第2分離膜が順次積層され、4層構造の基本単位体を形成する基本単位体形成段階;及び
少なくとも二つ以上の基本単位体を順次積層して単位体スタック部を形成する基本単位体積層段階を含み、
前記基本単位体は、前記電極と前記第1、第2分離膜が互いに接着されて形成され、
前記第1、第2分離膜は、接着力を有するコーティング物質が表面にコーティングされており、
前記第1分離膜は、前記第1電極と前記第2電極に対向する両面に前記コーティング物質がコーティングされ、前記第2分離膜は、前記第2電極に対向する一面にのみ前記コーティング物質がコーティングされ、
前記単位体スタック部の最上側又は最下側に位置する第1電極である第1末端電極に、第1補助単位体を積層する第1補助単位体積層段階をさらに含み、
前記第1補助単位体は、前記第1電極が正極で且つ前記第2電極が負極であるとき、前記第1末端電極から順次分離膜、負極、分離膜及び正極が積層されて形成され、前記第1電極が負極で且つ前記第2電極が正極であるとき、前記第1末端電極から順次分離膜及び正極が積層されて形成され、
前記第1補助単位体の正極は、集電体及び前記集電体の両面のうち、前記基本単位体に対向する一面にのみコーティングされる活物質を備える、ことを特徴とする電極組立体の製造方法。 - 前記第1、第2電極と前記第1、第2分離膜の接着は、前記第1、第2電極と前記第1、第2分離膜に圧力を加えることによる接着、又は前記第1、第2電極と前記第1、第2分離膜に圧力と熱を加えることによる接着であることを特徴とする請求項1に記載の電極組立体の製造方法。
- 前記コーティング物質は、無機物粒子とバインダ高分子の混合物であることを特徴とする請求項1に記載の電極組立体の製造方法。
- 前記単位体スタック部の最上側又は最下側に位置する第2分離膜である第2末端分離膜に、第2補助単位体を積層する第2補助単位体積層段階をさらに含み、
前記第2補助単位体は、前記第1電極が正極で且つ前記第2電極が負極であるとき正極として形成され、前記第1電極が負極で且つ前記第2電極が正極であるとき、前記第2末端分離膜から順次負極、分離膜及び正極が積層されて形成されることを特徴とする請求項1に記載の電極組立体の製造方法。 - 前記第2補助単位体の正極は、集電体及び前記集電体の両面のうち、前記基本単位体に対向する一面にのみコーティングされる活物質を備えることを特徴とする請求項4に記載の電極組立体の製造方法。
- 前記単位体スタック部の最上側又は最下側に位置する第2分離膜である第2末端分離膜に、第2補助単位体を積層する第2補助単位体積層段階をさらに含み、
前記第2補助単位体は、前記第1電極が正極で且つ前記第2電極が負極であるとき、前記第2末端分離膜から順次第1正極、分離膜、負極、分離膜及び第2正極が積層されて形成され、
前記第2補助単位体の第2正極は、集電体及び前記集電体の両面のうち、前記基本単位体に対向する一面にのみコーティングされる活物質を備えることを特徴とする請求項1に記載の電極組立体の製造方法。 - 前記単位体スタック部の最上側又は最下側に位置する第2分離膜である第2末端分離膜に、第2補助単位体を積層する第2補助単位体積層段階をさらに含み、
前記第2補助単位体は、前記第1電極が負極で且つ前記第2電極が正極であるとき、前記第2末端分離膜から順次負極、分離膜、正極、分離膜及び負極が積層されて形成されることを特徴とする請求項1に記載の電極組立体の製造方法。 - 前記単位体スタック部の側面又は全面を、高分子テープを用いてテーピングして固定させる固定段階をさらに含む請求項1に記載の電極組立体の製造方法。
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JP2015513195A (ja) | 2015-04-30 |
US20140349192A1 (en) | 2014-11-27 |
TW201351751A (zh) | 2013-12-16 |
EP3671929A1 (en) | 2020-06-24 |
EP3961780A1 (en) | 2022-03-02 |
EP2808933A4 (en) | 2015-07-15 |
US20200212420A1 (en) | 2020-07-02 |
TWI484681B (zh) | 2015-05-11 |
PL2808933T3 (pl) | 2019-09-30 |
EP3961780B1 (en) | 2023-09-20 |
US11081682B2 (en) | 2021-08-03 |
US20190044125A1 (en) | 2019-02-07 |
EP3471188B1 (en) | 2020-05-13 |
PL3671929T3 (pl) | 2022-03-21 |
KR20130131247A (ko) | 2013-12-03 |
EP3671929B1 (en) | 2021-11-24 |
KR101510518B1 (ko) | 2015-04-10 |
CN104170151B (zh) | 2018-02-02 |
WO2013176498A1 (ko) | 2013-11-28 |
EP3471188A1 (en) | 2019-04-17 |
US10770713B2 (en) | 2020-09-08 |
US10147932B2 (en) | 2018-12-04 |
EP2808933A1 (en) | 2014-12-03 |
PL3471188T3 (pl) | 2020-09-07 |
EP2808933B1 (en) | 2019-02-20 |
CN104170151A (zh) | 2014-11-26 |
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